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Purchased Loans - Purchased With Deteriorated Credit (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total Purchased Credit Deteriorated Loans | $ 9,034,103 | $ 7,574,111
Purchased | Receivables Acquired with Deteriorated Credit Quality |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total Purchased Credit Deteriorated Loans | 222,254 | 227,260
Purchased | Receivables Acquired with Deteriorated Credit Quality | Commercial, financial, agricultural |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total Purchased Credit Deteriorated Loans | 29,143 | 15,315
Purchased | Receivables Acquired with Deteriorated Credit Quality | Lease financing |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total Purchased Credit Deteriorated Loans | 0 | 0
Purchased | Receivables Acquired with Deteriorated Credit Quality | Real estate – construction |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total Purchased Credit Deteriorated Loans | 0 | 0
Purchased | Receivables Acquired with Deteriorated Credit Quality | Real estate – 1-4 family mortgage |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total Purchased Credit Deteriorated Loans | 48,243 | 53,969
Purchased | Receivables Acquired with Deteriorated Credit Quality | Real estate – commercial mortgage |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total Purchased Credit Deteriorated Loans | 140,438 | 156,338
Purchased | Receivables Acquired with Deteriorated Credit Quality | Installment loans to individuals |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total Purchased Credit Deteriorated Loans | $ 4,430 | $ 1,638

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- Definition Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums over and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes loans and leases covered under loss sharing agreements. + References No definition available. + Details
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